Feature : Ultra Compact Design, Super Bass. Support LINE IN, TF Card, USB & FM Radio. Easy connect to Smartphones. iPad, MP3/MP4 Players, Laptop etc. Built-in Microphone for Hands-Free Call. Dual Large 50mm Speaker units with vibrating membrane. Built-in efficient & Safe Li-ion Battery. Specification : New design Big sound Bluetooth speaker(12W). Full Bass Sound from Ultra Compact Structure. Multi Functions: Support Bluetooth /AUX in/TF card/USB/FM. Built-in Microphone, Support hands free call. Speaker: ?50mm 6W*2. Bluetooth 2.1+EDR, easy connect to Bluetooth devices. Operating Distance: 10M. Support Music from TF card: MP3, WMA etc. Frequency Response: 150HZ~18KHZ, SNR: >86dB. Battery: Built-in Li-ion battery 1500mAh. Working time: Music 6-10hrs, Call Time 4-5 hrs. Charging time: 2-3 hrs. Materials: ABS case+Metal mesh+ Silicone.